<table border="1px" cellspacing="0" cellpadding="10px">
     <th colspan="3" align="center">菜价单</th>
    <tr>
        <th rowspan="3">序号</th>
        <td>白菜</td>
        <td>3¥</td>
    </tr>    
    <tr>
        <td>青菜</td>
        <td>3¥</td>
    </tr>
    <tr>
        <td>芹菜</td>
        <td>3¥</td>
    </tr>
  </table>